Examples with RuntimeProgramContext co.cask.cdap.data.RuntimeProgramContext used on opensource projects

Example 1 with RuntimeProgramContext

use of co.cask.cdap.data.RuntimeProgramContext in project cdap by caskdata.

the class AbstractContext method createRuntimeProgramContext.

/**
   * Creates a new instance of {@link RuntimeProgramContext} to be
   * provided to {@link RuntimeProgramContextAware} dataset.
   */
private RuntimeProgramContext createRuntimeProgramContext(final DatasetId datasetId) {
    return new RuntimeProgramContext() {

        @Override
        public void notifyNewPartitions(Collection<? extends PartitionKey> partitionKeys) throws IOException {
            String topic = cConf.get(Constants.Dataset.DATA_EVENT_TOPIC);
            if (Strings.isNullOrEmpty(topic)) {
                // Don't publish if there is no data event topic
                return;
            }
            TopicId dataEventTopic = NamespaceId.SYSTEM.topic(topic);
            MessagePublisher publisher = getMessagingContext().getMessagePublisher();
            byte[] payload = Bytes.toBytes(GSON.toJson(Notification.forPartitions(datasetId, partitionKeys)));
            int failure = 0;
            long startTime = System.currentTimeMillis();
            while (true) {
                try {
                    publisher.publish(dataEventTopic.getNamespace(), dataEventTopic.getTopic(), payload);
                    return;
                } catch (TopicNotFoundException e) {
                    // this shouldn't happen since the TMS creates the data event topic on startup.
                    throw new IOException("Unexpected exception due to missing topic '" + dataEventTopic + "'", e);
                } catch (IOException e) {
                    long sleepTime = retryStrategy.nextRetry(++failure, startTime);
                    if (sleepTime < 0) {
                        throw e;
                    }
                    try {
                        TimeUnit.MILLISECONDS.sleep(sleepTime);
                    } catch (InterruptedException ex) {
                        // If interrupted during sleep, just reset the interrupt flag and return
                        Thread.currentThread().interrupt();
                        return;
                    }
                }
            }
        }

        @Override
        public ProgramRunId getProgramRunId() {
            return programRunId;
        }

        @Nullable
        @Override
        public NamespacedEntityId getComponentId() {
            return AbstractContext.this.getComponentId();
        }
    };
}